Error "NSFileProviderInternalErrorDomain error 12"

Anybody know of where on developer.apple.com I can find a *list* of NSFileProviderInternalErrorDomain errors? I can find "NSFileProviderErrorDomain" but it just lists the English-language error names,

And I assume "NSFileProviderInternalErrorDomain" is well - secret stuff that isn't in the public APISs, but is still reported when it occurs. It shouldn't - but well, it does. Apple stuff of course works all well and magical unless something doesn't quite work (internet bandwidth latency, too little storage space, too much memory pressure, etc).

[Edited by Moderator]